CN113514383A - Device and method for testing heights of two belts of top plate - Google Patents
Device and method for testing heights of two belts of top plate Download PDFInfo
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- CN113514383A CN113514383A CN202110675855.4A CN202110675855A CN113514383A CN 113514383 A CN113514383 A CN 113514383A CN 202110675855 A CN202110675855 A CN 202110675855A CN 113514383 A CN113514383 A CN 113514383A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
Abstract
A device and a method for testing the height of two belts of a top plate are disclosed, the device comprises: the first hole sealing capsule and the second hole sealing capsule are connected through a double-acting connecting mechanism, and compression and reset control is performed through the expansion and contraction of the double-acting connecting mechanism; the upper end of the test rod is connected with the rigid water pipe in the second hole sealing capsule; the oil pump is connected with an annular rodless cavity of the double-acting connecting mechanism and is used for controlling synchronous telescopic action of two plunger jacks in the double-acting connecting mechanism; the water pump is connected with the test rod through a water injection pipe. The method comprises the following steps: arranging equipment; the first hole sealing capsule and the second hole sealing capsule are connected through a double-acting connecting mechanism; pushing the drill hole, and recording the pushing depth; pressurizing by an oil pump to enable the double-acting connecting mechanism to extend out and extrude the hole sealing capsule; starting a water pump to inject water to the hole sealing section; recording the amount of water injected from the start to the end and the time used for the process; and calculating the heights of the two belts of the top plate. The system and the method can ensure the rapid retraction and reset of the hole sealing capsule, and can effectively reduce the influence of the breakage of equipment on the measurement result.
Description
Technical Field
The invention belongs to the technical field of pressurized water testing, and particularly relates to a device and a method for testing the height of two belts of a top plate.
Background
The coal mine overburden rock destruction parameters are scientific basis for reasonably reserving waterproof coal pillars in a mine and are the premise of guaranteeing safe production of the mine and recycling coal resources as much as possible. The coal mining changes the original rock stress field of the rock mass, so that the rock mass around the stope, particularly the overlying rock mass, is subjected to moving damage. The range and degree of overlying strata damage directly determine underwater coal mining, and the probability and safety of the upper limit of mining are improved. Therefore, the covered rock damage moving rule is cleared, and the important content which is necessary for releasing the coal pressing quantity under the water body and ensuring the safe production of the mine is provided.
The drilling water injection method is a common method for obtaining overburden failure parameters and obtaining the heights of two zones. The method is mainly an in-situ test method for measuring the permeability coefficient of rock and soil mass by injecting clear water into a hole. According to the size of the stratum permeability coefficient, the water permeability level of the rock-soil body can be judged, so that geological basis is provided for judging the overburden rock damage movement rule. The evaluation of the permeability condition of the engineering rock-soil body is directly influenced by the achievement of the drilling water injection and drainage method. Therefore, the reliability of the water flooding method by drilling is very important, but the following problems often exist in the practical operation process of the traditional water flooding method by drilling:
(1) for the deep hole, the test distance is large, so that the speed of injecting and discharging the capsule by air (water) pressure is slow, and the test efficiency is seriously influenced; in addition, when the capsule contracts automatically, large friction force is generated between the capsule and a rock body, whether the capsule contracts completely is usually difficult to judge according to the numerical value of the gas (water) pressure gauge, and the drill can be normally lifted after the gas (water) pressure gauge returns to zero for more than half an hour. If the shrinkage time of the capsule is not controlled well, the capsule is clamped in a drill hole in the process of lifting the drill, and the whole set of capsule is scrapped after the capsule is forcibly lifted, so that the test cost is greatly increased; if the capsule is not forcibly pulled out and broken in the drill hole, the drill hole is scrapped, so that the drill hole needs to be re-drilled, time, labor and expense are wasted, and the optimal observation time is more likely to be missed.
(2) The tested rock stratum is generally divided into a hard rock stratum, a soft rock stratum and a soft-hard alternate rock stratum, if the soft rock stratum or the soft-hard alternate rock stratum is met during the test, the expanded capsule can be embedded between the soft rock stratum or the soft-hard alternate rock stratum due to large gas (water) pressure, and even if the capsule is decompressed after the test is finished, the capsule cannot shrink normally and is finally clamped in the drill hole. If the test result is provided forcibly, the whole set of capsules can still be scrapped, so that the test cost is increased; if the capsule is not forcibly lifted, the drilled hole is scrapped, so that the drilled hole needs to be re-drilled, time, labor and expense are wasted, the optimal observation time is more likely to be missed, meanwhile, the available data cannot be effectively acquired due to frequent replacement of the drilled hole, no reference contrast exists when the cracks are macroscopically changed at different time in the same position, and the reliability of the detection result is greatly reduced.
(3) Because the capsule used by the traditional test method belongs to an expansion type capsule controlled by air (water) pressure, the outer surface of the pressure stabilizing layer is thinner. Rock mass structure is complicated in the drilling, if the in-process of suppressing meets sharp-pointed rock, has the rock of edges and corners or the broken area of rock, causes the damaged probability of capsule stabilivolt extexine very big, leads to the condition that gas leakage (water) appear in the capsule easily, and then can cause the capsule to keep apart the effect poor, leads to the water injection volume under the same pressure big partially, makes the osmotic coefficient big partially, does not accord with actual stratum, makes the pressurized-water test data can not use.
(4) The conventional capsule pressure stabilizing layer has a thin surface, the elasticity of the surface of the capsule pressure stabilizing layer is reduced or even loses efficacy after the conventional capsule pressure stabilizing layer is used for too many times, and when the capsule is recovered after the test is finished, the capsule can possibly shrink, so that the risk coefficient of the capsule clamped in a drilled hole is increased. Similar to the two cases, if the capsule is forcibly proposed, the rejection of the capsule is easy to cause; if the capsule is not forcibly lifted, it may result in the drill being scrapped.
(5) The isolation test section is often inflated (water) through two capsules and is realized effectively keeping apart, but just realizes the intercommunication of business turn over gas (water) through a tubule between two capsules, and suppress at every turn and all squeeze into from upper portion capsule, then enter into the lower part capsule through the tubule, and this will lead to two capsule pressure disequilibrium. Because the test is high in concealment, whether the capsules synchronously expand or not can not be directly observed, the numerical value of the pressure gauge is not the common pressure value of the two capsules, and the possibility of misjudgment is high. When the upper capsule reaches the pressure level, the lower capsule may not actually reach the pressure level, which may result in the isolation being invalid and hence in invalid measurement data.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for testing the height of two top plates, which can ensure the rapid retraction and resetting of a hole sealing capsule, effectively reduce the influence of the breakage of equipment on a measurement result, reduce the drilling failure rate, reduce the economic loss in the testing process, facilitate the rapid and accurate acquisition of rock stratum permeability indexes, ensure the repeated use of the equipment for many times and ensure the accuracy and reliability of data. The method has simple operation steps and high test efficiency, and can effectively avoid the situation that the hole sealing capsule can not be normally retracted.
In order to solve the technical problem, the invention provides a device for testing the height of two belts of a top plate, which comprises a first hole sealing capsule, a second hole sealing capsule, a testing rod, a double-acting connecting mechanism, an oil pump, a pressure measuring instrument and a water pump, wherein the first hole sealing capsule is arranged on the top plate;
the first hole sealing capsule, the double-acting connecting mechanism and the second hole sealing capsule are coaxially arranged from top to bottom;
the first hole sealing capsule comprises a first rigid water pipe, a first capsule body, a first rigid guide sleeve, a second rigid guide sleeve and a plurality of first connecting rings, wherein the first rigid water pipe, the first capsule body, the first rigid guide sleeve, the second rigid guide sleeve and the plurality of first connecting rings are positioned in the center; the upper end of the first rigid water pipe is closed, an external thread structure I is arranged on the outer side of the lower end of the first rigid water pipe, and a first annular through hole is formed in the center of the first capsule body and sleeved on the outer side of the middle part of the first rigid water pipe through the first annular through hole; the first rigid guide sleeve is fixedly sleeved outside the upper part of the first rigid water pipe, and the lower end of the first rigid guide sleeve is fixedly connected with the upper end of the first capsule body; the second rigid guide sleeve is sleeved outside the lower part of the first rigid water pipe in a sliding manner, and the upper end of the second rigid guide sleeve is fixedly connected with the lower end of the first capsule body; the first connecting rings are annularly and uniformly fixedly connected to the lower end face of the second rigid guide sleeve;
the double-acting connecting mechanism comprises a rigid shell, two plunger jacks, a rigid communicating pipe, a rigid oil pipe B and two hollow sleeves; the rigid shell is of a cylindrical structure, the inner side of the upper end and the inner side of the lower end of the rigid shell are respectively and fixedly connected with an annular limiting plate A and an annular limiting plate B, the upper end face of the annular limiting plate A is annularly and uniformly and fixedly connected with a plurality of second connecting rings, the plurality of second connecting rings and the plurality of first connecting rings are arranged in a one-to-one corresponding mode, and the first connecting rings and the second connecting rings are connected through first springs; a plurality of third connecting rings are fixedly connected to the lower end face of the annular limiting plate B uniformly in the annular direction; axial through holes are formed in the axes of the two plunger plugs, the axial through holes are arranged at the upper part and the lower part of the inner cavity of the rigid shell in an up-and-down symmetrical mode, and the outer circular surfaces of the axial through holes are respectively in sliding sealing fit with the inner circular surfaces of the annular limiting plate A and the annular limiting plate B; the outer sides of the ends, close to the two plunger jacks, of the two plunger jacks are fixedly connected with annular bosses A, and the outer circular surfaces of the two annular bosses A are in sliding sealing fit with the inner side wall of the rigid shell; the outer diameter of the rigid communicating pipe is the same as that of the first rigid water pipe, and the rigid communicating pipe is inserted into the axial through holes of the two plunger jacks and is in sliding sealing fit with the axial through holes; the inner side of the upper end and the inner side of the lower end of the rigid communicating pipe are respectively provided with a first internal thread structure and a second internal thread structure, and the upper end of the rigid communicating pipe is fixedly sleeved on the inner side of the lower end of the first rigid water pipe through the matching of the first internal thread structure and the first external thread structure; an annular rodless cavity is formed by enclosing the rigid shell, the rigid communicating pipe and the two annular bosses A; an upper annular rod cavity is formed by enclosing the upper part of the rigid shell, the plunger top at the upper side, the annular boss A at the upper side and the annular limiting plate A, and an upper oil inlet and outlet pipeline communicated with the upper annular rod cavity is fixedly connected to the upper part of the rigid shell; a lower annular rod cavity is formed by enclosing the lower part of the rigid shell, the plunger top at the lower side, the annular boss A at the lower side and the annular limiting plate B, and a lower oil inlet and outlet pipeline communicated with the lower annular rod cavity is fixedly connected to the lower part of the rigid shell; the rigid oil pipe B is coaxially arranged at the center of the rigid communicating pipe, the upper end of the rigid oil pipe B is bent and penetrates out of the middle part of the rigid communicating pipe to enter the annular rodless cavity, and the rigid oil pipe B is fixedly connected with the rigid communicating pipe; the lower end of the rigid oil pipe B is fixedly connected with the inner side wall of the lower end of the rigid communicating pipe through a plurality of first connecting rods; the two hollow sleeves are radially arranged in the annular rodless cavity, the inner ends of the two hollow sleeves are respectively and fixedly connected to the side walls of the two opposite sides of the middle part of the rigid communicating pipe, and the two hollow sleeves are communicated with the inner cavity of the rigid communicating pipe through two radial holes A formed in the two opposite sides of the middle part of the rigid communicating pipe; the outer ends of the two hollow sleeves are respectively fixedly inserted into two radial holes B on two opposite sides of the middle part of the rigid shell and are in sealing fit with the radial holes B; the upper oil inlet and outlet pipeline and the lower oil inlet and outlet pipeline are respectively communicated with an oil tank arranged on the ground through a long oil pipe A;
the second hole sealing capsule comprises a second rigid water pipe, a rigid oil pipe A, a second capsule body, a third rigid guide sleeve, a fourth rigid guide sleeve and a plurality of fourth connecting rings, wherein the second rigid water pipe, the rigid oil pipe A, the second capsule body, the third rigid guide sleeve, the fourth rigid guide sleeve and the plurality of fourth connecting rings are positioned in the center; the outer diameter of the second rigid water pipe is the same as that of the first rigid water pipe, the lower end of the second rigid water pipe is fixedly connected with a test rod joint, the outer side of the upper end of the second rigid water pipe is provided with a second external thread structure, and the second external thread structure and the second internal thread structure are matched in a threaded manner and inserted into the outer side of the lower end of the rigid communicating pipe; the rigid oil pipe A is coaxially arranged at the center of the second rigid water pipe, the upper end of the rigid oil pipe A is fixedly connected with the lower end of the rigid oil pipe B, the pipe wall of the upper end of the rigid oil pipe A is fixedly connected with the inner side wall of the upper end of the second rigid water pipe through a plurality of radially distributed connecting rods A, and the lower end of the rigid oil pipe A penetrates through the pipe wall of the lower end of the second rigid water pipe after being bent and is fixedly connected with the second rigid water pipe; a second annular through hole is formed in the center of the second capsule body and is sleeved outside the middle part of the second rigid water pipe through the second annular through hole; the third rigid guide sleeve is sleeved outside the upper part of the second rigid water pipe in a sliding manner, and the lower end of the third rigid guide sleeve is fixedly connected with the upper end of the second capsule body; the fourth rigid guide sleeve is fixedly sleeved on the outer side of the lower part of the second rigid water pipe, and the upper end of the fourth rigid guide sleeve is fixedly connected with the lower end of the second capsule body; a plurality of fourth connecting rings are annularly and uniformly fixedly connected to the upper end surface of the third rigid guide sleeve; the plurality of fourth connecting rings and the plurality of third connecting rings are arranged in a one-to-one correspondence manner, and the fourth connecting rings and the third connecting rings are connected through second springs;
an axial through hole is formed in the axis of the test rod, the upper end of the test rod is fixedly inserted into the test rod joint and is communicated with the inner cavity of the second rigid water pipe through the test rod joint;
the oil pump is communicated with the upper end of the rigid oil pipe A in the second hole sealing capsule through the long oil pipe B;
the water pump is connected with the axial through hole of the test rod through a water injection pipe with a pressure measuring instrument.
In the technical scheme, the two plunger jacks are arranged in the rigid shell in a sliding manner and are respectively in contact fit with the first hole sealing capsule and the second hole sealing capsule, so that after hydraulic oil is injected into the annular rodless cavity, the two plunger jacks can synchronously and quickly extend out towards the upper side and the lower side, the third rigid guide sleeve can be jacked downwards, the second rigid guide sleeve can be jacked upwards, the first capsule body and the second capsule body are compressed, and the capsule bodies are expanded and tightly attached to the surrounding rock; by means of sliding fit of the second rigid guide sleeve and the first rigid water pipe and fixed connection of the first rigid guide sleeve and the first rigid water pipe, the state of the first capsule body can be changed by sliding of the second rigid guide sleeve on the first rigid water pipe, and accordingly convenient switching of expansion and reset states is achieved; by means of sliding fit of the third rigid guide sleeve and the second rigid water pipe and fixed connection of the fourth rigid guide sleeve and the second rigid water pipe, the state of the second capsule body can be changed by sliding of the third rigid guide sleeve on the second rigid water pipe, and accordingly convenient switching of expansion and reset states is achieved; through the setting of first and second spring, can be after annular rodless chamber pressure release, and the in-process that two plunger top retracted, with second rigidity uide bushing and third rigidity uide bushing respectively downwards and upwards pull-up, and then make first and second capsule body reconversion rapidly, can effectively avoid the capsule body to appear by the unable normal condition of retracting from the inlayed soft rock of elasticity of itself, be favorable to whole test assembly's quick recovery. The two ends of the rigid communicating pipe are respectively connected with the first rigid water pipe and the second rigid water pipe, so that the two sleeves are communicated with the inner cavity of the rigid communicating pipe and the outside of the rigid shell, water can be conveniently injected into the hole sealing section, and water can be favorably permeated into a hole wall crack. The water pump, the pressure regulating water valve and the pressure measuring instrument are arranged, so that constant-pressure water injection can be conveniently realized, and various test conditions required in the test process can be met; the oil pump is connected with the upper end of the middle rigid oil pipe A in the second hole sealing capsule through the long oil pipe B, so that hydraulic oil can be conveniently filled into the annular rodless cavity in the double-acting connecting mechanism through the oil pump, and different positions of the testing rod in a drill hole can be locked. The system has the advantages of simple structure, convenience and quickness in manufacturing, low manufacturing cost, convenience in operation, safety and reliability in operation process, and is beneficial to quickly and accurately acquiring the rock stratum permeability index.
Further, for convenient installation and dismantlement, the inside that the test rod connects is provided with the thread cavity, the upper end outside of test rod is provided with the screwed joint, and the test rod passes through the fixed cartridge of screw-thread fit in the thread cavity that the test rod connects.
Further, in order to facilitate installation and disassembly, the rigid communicating pipe is fixedly connected with two short joints at the outer sides of the two radial holes A, the two short joints are of cylindrical structures, inner cavities at the outer sides of the short joints are provided with internal thread structures D, and inner cavities at the inner ends of the short joints are communicated with the inner cavity of the rigid communicating pipe through the radial holes A; external screw thread structure D has all been seted up to two hollow sheathed tube inner ends, and the screw-thread fit cartridge through external screw thread structure D and internal thread structure D is in two short connectors.
Further, in order to have good sealing performance, the rigid shell is correspondingly provided with two containing grooves which are concave inwards at the parts of the two radial holes B;
the outer ends of the two hollow sleeves are correspondingly and fixedly connected with two annular bosses B outside the two accommodating grooves;
two waterproof sealing rings are correspondingly arranged between the two annular bosses B and the two accommodating grooves.
Further, in order to improve the universality of the system, the test rod is formed by sequentially connecting a plurality of sections of single drill rods with the same size.
The invention also provides a method for testing the heights of the two belts of the top plate, which comprises the following steps:
the method comprises the following steps: placing the oil pump, the pressure measuring instrument, the water pump and the oil tank at corresponding positions on the ground, and connecting the oil outlet end of the long oil pipe B with the upper end of the rigid oil pipe A in the second hole sealing capsule in a through manner;
step two: fixedly connecting the first hole sealing capsule and the second hole sealing capsule through a double-acting connecting mechanism, connecting a third connecting ring and a fourth connecting ring through a second spring, and connecting a first connecting ring and a second connecting ring through a first spring so as to assemble a hole sealing assembly; fixedly connecting a test rod joint at the lower end of the assembled hole sealing assembly to the upper end of a test rod to form a test assembly, and starting to push the test assembly into a drill hole excavated in the top plate;
step three: recording the pushing depth in real time, and ensuring that the hole sealing assembly is accurately pushed to the position of the test section;
step four: after pushing is finished, the oil inlet end of the long oil pipe B is connected with the oil outlet of the oil pump, and the water pump is connected with the axial through hole at the upper end of the test rod through the water injection pipe;
step five: starting an oil pump to inject oil into an annular rodless cavity in the double-acting connecting mechanism, enabling two plunger jacks to completely extend out to the upper side and the lower side, further compressing a first capsule body and a second capsule body, enabling the first capsule body and the second capsule body to expand and cling to surrounding rocks, then starting a water pump to inject water in a water storage tank into an axial through hole in a test rod, and further injecting the water into a plugging hole section, and in the process, performing constant-pressure water injection through a pressure regulating valve and a pressure measuring instrument which are arranged on a water injection pipe;
step six: recording the amount of water injected from the start to the end and the time used for the process by observing the pressure gauge and the stopwatch;
step seven: after each section of experiment is finished, the double-acting connecting mechanism is decompressed, then the testing rod is recovered to repeat the fifth step and the sixth step on the next section of water pressing test section, after all the testing sections are finished, the water injection pipe and the long oil pipe are disassembled, and the hole sealing assembly is pulled out of the drill hole completely;
step eight: and calculating the water amount injected into the hole section in unit time and leaked through the hole wall cracks according to the total injected water amount and the total used time, and determining the heights of the two zones of the top plate.
In the method, two plunger jacks of the double-acting connecting mechanism respectively act on the first hole sealing capsule and the second hole sealing capsule, and the two plunger jacks are respectively connected with the slidable rigid guide sleeves in the first hole sealing capsule and the second hole sealing capsule through the first spring and the second spring, so that the two hole sealing capsules can be compressed in a mode that the two plunger jacks extend outwards in a pressurizing process, and further expansion is quickly realized; in addition, the quick reset of first, second hole sealing capsule can also be made through the drive of first and second spring at the in-process of pressure release, has avoided appearing the dead condition of card, can also very big reduction hole sealing capsule's recovery time, like this, acts on two plunger top through the oil pressure, the inflation and the shrink of realization hole sealing capsule that can be convenient have shortened greatly and have suppressed and the pressure release time, have improved test efficiency. The method has the advantages of small investment, easy construction, simple operation steps, short test process time and safe and reliable operation process, can solve the problem that the traditional capsule is difficult to retract under the test working condition of more soft rock, can ensure that the measurement result of data is more accurate, and has better popularization value and practicability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a first hole sealing capsule in the present invention;
FIG. 3 is a schematic structural view of a double acting linkage of the present invention;
FIG. 4 is a schematic structural view of a second hole sealing capsule according to the present invention;
FIG. 5 is an assembly schematic of the testing method of the present invention;
FIG. 6 is an assembly schematic of the test method of the present invention.
In the figure, 1, an oil pump, 2, a pressure measuring instrument, 3, a water pump, 4, an axial through hole, 5, a long oil pipe B, 6, a water injection pipe, 7, a test rod, 8, a first spring, 9, a second spring, 10, a waterproof sealing ring, 11, a second hole sealing capsule, 11.1, a second rigid water pipe, 11.2, a rigid oil pipe A, 11.3, a fourth rigid guide sleeve, 11.4, a second external thread structure, 11.5, a second capsule body, 11.6, a fourth connecting ring, 11.7, a connecting rod A, 11.8, a third rigid guide sleeve, 11.9, a test rod joint, 12, a first hole sealing capsule, 12.1, a first rigid water pipe, 12.2, a first connecting ring, 12.3, a second rigid guide sleeve, 12.5, a first capsule body, 12.6, a first rigid guide sleeve, 12.7, a first external thread structure, 13, a double-acting connecting rod mechanism, 13.1, a plunger top, a plunger head, a first rigid connecting rod, 13.2, a short connecting pipe, 13.5, a short connecting pipe, 13.9, a second rigid connecting pipe and a test rod joint, The oil pump comprises a rigid shell, 13.6, a hollow sleeve, 13.7, rigid oil pipes B, 13.8, a first internal thread structure, 13.9, annular limiting plates B, 13.10, annular limiting plates A, 13.11, annular bosses A, 13.12, an upper oil inlet and outlet pipeline, 13.13, a lower oil inlet and outlet pipeline, 13.14, a third connecting ring, 13.15, a second connecting ring, 13.16, a second internal thread structure, 13.17, an accommodating groove, 13.18, annular bosses B, 14, No. 1 drill holes, No. 15 and No. 2 drill holes, and No. 16 and No. 3 drill holes.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 to 6, the present invention provides a device for testing the height of two belts of a top plate, which comprises a first hole sealing capsule 12, a second hole sealing capsule 11, a testing rod 7, a double-acting connecting mechanism 13, an oil pump 1, a pressure measuring instrument 2 and a water pump 3;
the first hole sealing capsule 12, the double-acting connecting mechanism 13 and the second hole sealing capsule 11 are coaxially arranged from top to bottom;
the first hole sealing capsule 12 comprises a first rigid water pipe 12.1 positioned in the center, a first capsule body 12.5, a first rigid guide sleeve 12.6, a second rigid guide sleeve 12.3 and a plurality of first connecting rings 12.2; the upper end of the first rigid water pipe 12.1 is closed, the outer side of the lower end of the first rigid water pipe is provided with an external thread structure I12.7, the center of the first capsule body 12.5 is provided with a first annular through hole, and the first annular through hole is sleeved on the outer side of the middle part of the first rigid water pipe 12.1; the first rigid guide sleeve 12.6 is fixedly sleeved outside the upper part of the first rigid water pipe 12.1, and the lower end of the first rigid guide sleeve is fixedly connected with the upper end of the first capsule body 12.5; the second rigid guide sleeve 12.3 is sleeved outside the lower part of the first rigid water pipe 12.1 in a sliding manner, and the upper end of the second rigid guide sleeve is fixedly connected with the lower end of the first capsule body 12.5; a plurality of first connecting rings 12.2 are annularly and uniformly fixedly connected to the lower end surface of the second rigid guide sleeve 12.3;
the double-acting connecting mechanism 13 comprises a rigid shell 13.5, two plunger jacks 13.1, a rigid communicating pipe 13.3, a rigid oil pipe B13.7 and two hollow sleeves 13.6; the rigid shell 13.5 is of a cylindrical structure, the inner side of the upper end and the inner side of the lower end of the rigid shell 13.5 are respectively and fixedly connected with an annular limiting plate A13.10 and an annular limiting plate B13.9, the upper end face of the annular limiting plate A13.10 is annularly and uniformly and fixedly connected with a plurality of second connecting rings 13.15, the plurality of second connecting rings 13.15 and the plurality of first connecting rings 12.2 are arranged in a one-to-one corresponding mode, and the first connecting rings 12.2 and the second connecting rings 13.15 are connected through first springs 8; a plurality of third connecting rings 13.14 are fixedly and uniformly connected to the lower end surface of the annular limiting plate B13.9 in the circumferential direction; axial through holes are formed in the axle centers of the two plunger jacks 13.1, the axial through holes are arranged at the upper part and the lower part of the inner cavity of the rigid shell 13.5 in an up-down symmetrical mode, and the outer circular surfaces of the axial through holes are respectively in sliding sealing fit with the inner circular surfaces of the annular limiting plate A13.10 and the annular limiting plate B13.9; the outer sides of the ends, close to the two plunger jacks 13.1, of the two plunger jacks are fixedly connected with annular bosses A13.11, and the outer circular surfaces of the two annular bosses A13.11 are in sliding sealing fit with the inner side wall of the rigid shell 13.5; the outer diameter of the rigid communicating pipe 13.3 is the same as that of the first rigid water pipe 12.1, and the rigid communicating pipe is inserted into the axial through holes of the two plunger plungers 13.1 and is in sliding sealing fit with the axial through holes; the inner side of the upper end and the inner side of the lower end of the rigid communicating pipe 13.3 are respectively provided with a first internal thread structure 13.8 and a second internal thread structure 13.16, and the upper end of the rigid communicating pipe is fixedly sleeved on the inner side of the lower end of the first rigid water pipe 12.1 through the matching of the first internal thread structure 13.8 and the first external thread structure 12.7; an annular rodless cavity is enclosed among the rigid shell 13.5, the rigid communicating pipe 13.3 and the two annular bosses A13.11; an upper annular rod cavity is formed by enclosing the upper part of the rigid shell 13.5, the plunger top head 13.1 at the upper side, the annular boss A13.11 at the upper side and the annular limiting plate A13.10, and an upper oil inlet and outlet pipeline 13.12 communicated with the upper annular rod cavity is fixedly connected to the upper part of the rigid shell 13.5; a lower annular rod cavity is formed by enclosing between the lower part of the rigid shell 13.5, the plunger top head 13.1 at the lower side, the annular boss A13.11 at the lower side and the annular limit plate B13.9, and a lower oil inlet and outlet pipeline 13.13 communicated with the lower annular rod cavity is fixedly connected to the lower part of the rigid shell 13.5; the rigid oil pipe B13.7 is coaxially arranged at the center of the rigid communicating pipe 13.3, the upper end of the rigid oil pipe B is bent and penetrates out of the middle part of the rigid communicating pipe 13.3 to enter the annular rodless cavity, and the rigid oil pipe B is fixedly connected with the rigid communicating pipe 13.3; the lower end of the rigid oil pipe B13.7 is fixedly connected with the inner side wall at the lower end of the rigid communicating pipe 13.3 through a plurality of first connecting rods 13.2; the two hollow sleeves 13.6 are radially arranged in the annular rodless cavity, the inner ends of the two hollow sleeves are respectively and fixedly connected to the side walls of the two opposite sides of the middle part of the rigid communicating pipe 13.3, and the two hollow sleeves are communicated with the inner cavity of the rigid communicating pipe 13.3 through two radial holes A formed in the two opposite sides of the middle part of the rigid communicating pipe 13.3; the outer ends of the two hollow sleeves 13.6 are respectively fixedly inserted into two radial holes B on two opposite sides of the middle part of the rigid shell 13.5 and are in sealing fit with the radial holes B; the upper oil inlet and outlet pipeline 13.12 and the lower oil inlet and outlet pipeline 13.13 are respectively communicated with an oil tank arranged on the ground through a long oil pipe A;
the second hole sealing capsule 11 comprises a second rigid water pipe 11.1, a rigid oil pipe A11.2, a second capsule body 11.5, a third rigid guide sleeve 11.8, a fourth rigid guide sleeve 11.3 and a plurality of fourth connecting rings 11.6 which are positioned in the center; the outer diameter of the second rigid water pipe 11.1 is the same as that of the first rigid water pipe 12.1, the lower end of the second rigid water pipe 11.1 is fixedly connected with a test rod joint 11.9, the outer side of the upper end of the second rigid water pipe is provided with a second external thread structure 11.4, and the second external thread structure 11.4 and the second internal thread structure 13.16 are inserted and connected to the outer side of the lower end of the rigid communicating pipe 13.3 in a threaded fit manner; the rigid oil pipe A11.2 is coaxially arranged at the center of the second rigid water pipe 11.1, the upper end of the rigid oil pipe A is fixedly connected with the lower end of the rigid oil pipe B13.7, the pipe wall of the upper end of the rigid oil pipe A is fixedly connected with the inner side wall of the upper end of the second rigid water pipe 11.1 through a plurality of radially distributed connecting rods A11.7, and the lower end of the rigid oil pipe A is bent, penetrates out of the pipe wall of the lower end of the second rigid water pipe 11.1 and is fixedly connected with the second rigid water pipe 11.1; a second annular through hole is formed in the center of the second capsule body 11.5, and the second annular through hole is sleeved on the outer side of the middle part of the second rigid water pipe 11.1; the third rigid guide sleeve 11.8 is sleeved outside the upper part of the second rigid water pipe 11.1 in a sliding manner, and the lower end of the third rigid guide sleeve is fixedly connected with the upper end of the second capsule body 11.5; the fourth rigid guide sleeve 11.3 is fixedly sleeved outside the lower part of the second rigid water pipe 11.1, and the upper end of the fourth rigid guide sleeve is fixedly connected with the lower end of the second capsule body 11.5; a plurality of fourth connecting rings 11.6 are annularly and uniformly fixedly connected to the upper end face of the third rigid guide sleeve 11.8; the plurality of fourth connecting rings 11.6 and the plurality of third connecting rings 13.14 are arranged in a one-to-one correspondence manner, and the fourth connecting rings 11.6 and the third connecting rings 13.14 are connected through second springs 9;
an axial through hole 4 is formed in the axis of the test rod 7, the upper end of the axial through hole is fixedly inserted into a test rod joint 11.9, and the axial through hole is communicated with the inner cavity of a second rigid water pipe 11.1 through the test rod joint 11.9;
the oil pump 1 is communicated with the upper end of a rigid oil pipe A11.2 in the second hole sealing capsule 11 through a long oil pipe B5;
the water pump 3 is connected with the axial through hole 4 of the test rod 7 through a water injection pipe 6 with the pressure measuring instrument 2.
The inside of test rod connects 11.9 is provided with the thread cavity, the upper end outside of test rod 7 is provided with the screwed joint, and fixed cartridge in the thread cavity of test rod connects 11.9 is passed through in screw-thread fit to test rod 7.
In order to facilitate installation and disassembly, the rigid communicating pipe 13.3 is fixedly connected with two short joints 13.4 at the outer sides of the two radial holes A, the two short joints 13.4 are both of a cylindrical structure, inner cavities at the outer sides of the short joints are both provided with internal thread structures D, and inner cavities at the inner ends of the short joints are both communicated with the inner cavity of the rigid communicating pipe 13.3 through the radial holes A; external screw thread structure D has all been seted up to two hollow sleeve 13.6's inner end, and the screw-thread fit cartridge through external screw thread structure D and internal thread structure D is in two short connectors 13.4.
In order to have good sealing performance, the rigid shell 13.5 is correspondingly provided with two containing grooves 13.17 which are concave towards the inner side at the parts of the two radial holes B;
the outer ends of the two hollow sleeves 13.6 are correspondingly and fixedly connected with two annular bosses B13.18 at the outer sides of the two accommodating grooves 13.17;
two waterproof sealing rings 10 are correspondingly arranged between the two annular bosses B13.18 and the two accommodating grooves 13.17.
In order to improve the universality of the system, the test rod 7 is formed by sequentially connecting a plurality of single drill rods with the same size.
Because the conventional capsule only realizes air (water) inlet and outlet through a small water pipe, and the air (water) is injected from the capsule on one side during each pressing, and then enters the capsule on the lower part through the air pipe, the pressure of the two capsules is unbalanced, the two capsules cannot be effectively isolated at the same time, and the possibility of misjudgment is high. The first hole sealing capsule and the second hole sealing capsule are connected through the double-acting connecting mechanism, the test section is isolated, the two solid capsules can be simultaneously acted by the two plunger jacks, the two hole sealing capsules can be stressed uniformly, and the accuracy of a test result is improved.
Preferably, the first capsule body 12.5 and the second capsule body 11.5 are made of solid rubber, the situation that the capsule cannot be used after being slightly broken by air (water) leakage like a conventional inflatable (water) capsule does not occur, the risk that equipment is damaged and cannot be used is eliminated, the stability and the tightness during isolation are improved due to a thick structure, and therefore the service life of the capsule is longer than that of the conventional capsule.
The two plunger jacks are arranged in the rigid shell in a sliding manner and are respectively in contact fit with the first hole sealing capsule and the second hole sealing capsule, so that after hydraulic oil is injected into the annular rodless cavity, the two plunger jacks can synchronously and quickly extend out towards the upper side and the lower side, the third rigid guide sleeve can be jacked downwards, the second rigid guide sleeve can be jacked upwards, the first capsule body and the second capsule body are both compressed, and then the capsule bodies are expanded and tightly attached to the surrounding rock; by means of sliding fit of the second rigid guide sleeve and the first rigid water pipe and fixed connection of the first rigid guide sleeve and the first rigid water pipe, the state of the first capsule body can be changed by sliding of the second rigid guide sleeve on the first rigid water pipe, and accordingly convenient switching of expansion and reset states is achieved; by means of sliding fit of the third rigid guide sleeve and the second rigid water pipe and fixed connection of the fourth rigid guide sleeve and the second rigid water pipe, the state of the second capsule body can be changed by sliding of the third rigid guide sleeve on the second rigid water pipe, and accordingly convenient switching of expansion and reset states is achieved; through the setting of first and second spring, can be after annular rodless chamber pressure release, and the in-process that two plunger top retracted, with second rigidity uide bushing and third rigidity uide bushing respectively downwards and upwards pull-up, and then make first and second capsule body reconversion rapidly, can effectively avoid the capsule body to appear by the unable normal condition of retracting from the inlayed soft rock of elasticity of itself, be favorable to whole test assembly's quick recovery. The two ends of the rigid communicating pipe are respectively connected with the first rigid water pipe and the second rigid water pipe, so that the two sleeves are communicated with the inner cavity of the rigid communicating pipe and the outside of the rigid shell, water can be conveniently injected into the hole sealing section, and water can be favorably permeated into a hole wall crack. The water pump, the pressure regulating water valve and the pressure measuring instrument are arranged, so that constant-pressure water injection can be conveniently realized, and various test conditions required in the test process can be met; the oil pump is connected with the upper end of the middle rigid oil pipe A in the second hole sealing capsule through the long oil pipe B, so that hydraulic oil can be conveniently filled into the annular rodless cavity in the double-acting connecting mechanism through the oil pump, and different positions of the testing rod in a drill hole can be locked. The system has the advantages of simple structure, convenience and quickness in manufacturing, low manufacturing cost, convenience in operation, safety and reliability in operation process, and is beneficial to quickly and accurately acquiring the rock stratum permeability index.
The invention also provides a method for testing the height of two belts of a top plate, and for detailed description, the following embodiments are given:
taking the height test of two zones of the top plate of a certain mine site in the coal field in North China as an example, as shown in the second drawing, the depths of three drilling holes are respectively 1#The hole depth is 60m and 2#The hole depth is 100m and 3#The hole depth is 90m, the hole diameter of the drilled hole is 100mm, the field water pump power is 30KW, and the pressing-in flow of the three drilling test sections is respectively measured.
The testing method for the height of the two belts of the top plate comprises the following steps:
the method comprises the following steps: placing the oil pump 1, the pressure measuring instrument 2, the water pump 3 and the oil tank at corresponding positions on the ground, and connecting the oil outlet end of the long oil pipe B5 with the upper end of the rigid oil pipe A11.2 in the second hole sealing capsule 11 in a penetrating manner;
step two: fixedly connecting a first hole sealing capsule 12 and a second hole sealing capsule 11 through a double-acting connecting mechanism 13, connecting a third connecting ring 13.14 and a fourth connecting ring 11.6 through a second spring 9, and connecting a first connecting ring 12.2 and a second connecting ring 13.15 through a first spring 8, thereby assembling a hole sealing assembly, wherein in the embodiment, the maximum diameter of a rigid shell 13.5 in the double-acting connecting mechanism 13 is 75mm, and the maximum diameter of the hole sealing assembly is 80 mm; fixedly connecting a test rod joint 11.9 at the lower end of the assembled hole sealing assembly to the upper end of a test rod 7 to form a test assembly, and starting to push the test assembly into a No. 1 drill hole 14 dug on a top plate;
step three: recording the pushing depth in real time, and ensuring that the hole sealing assembly is accurately pushed to the position of the test section;
step four: after the pushing is finished, the oil inlet end of the long oil pipe B5 is connected with the oil outlet of the oil pump 1, and the water pump 3 is connected with the axial through hole 4 at the upper end of the test rod 7 through the water injection pipe 6;
step five: starting an oil pump 1 to inject oil into an annular rodless cavity in a double-acting connecting mechanism 13, enabling two plunger jacks 13.1 to completely extend out of the upper side and the lower side, further compressing a first capsule body 12.5 and a second capsule body 11.5, enabling the first capsule body 12.5 and the second capsule body 11.5 to expand and cling to surrounding rocks, then starting a water pump 3 to inject water in a water storage tank into an axial through hole 4 in a test rod 7, and further injecting the water into a plugging hole section, and in the process, performing constant-pressure water injection through a pressure regulating valve arranged on a water injection pipe 6 and a pressure measuring instrument 2; the injected water is injected into the plugging hole section through the two hollow sleeves 13.6;
step six: by observing the pressure gauge 2 and the stopwatch, the quantity of water injected from the start to the end and the time used for the process are recorded;
step seven: after each section of experiment is finished, the double-acting connecting mechanism 13 is decompressed, then the test rod 7 is recovered, and the fifth step and the sixth step are repeated on the next water pressing test section, after all the test sections are tested, the water injection pipe 6 and the long oil pipe 5 are disassembled, the hole sealing assembly is completely pulled out of the drill hole, and the test is carried out on the No. 2 drill hole 15 and the No. 3 drill hole 16;
step eight: and calculating the water amount injected into the hole section in unit time and leaked through the hole wall cracks according to the total injected water amount and the total used time, and determining the heights of the two zones of the top plate.
In the method, two plunger jacks of the double-acting connecting mechanism respectively act on the first hole sealing capsule and the second hole sealing capsule, and the two plunger jacks are respectively connected with the slidable rigid guide sleeves in the first hole sealing capsule and the second hole sealing capsule through the first spring and the second spring, so that the two hole sealing capsules can be compressed in a mode that the two plunger jacks extend outwards in a pressurizing process, and further expansion is quickly realized; in addition, the quick reset of first, second hole sealing capsule can also be made through the drive of first and second spring at the in-process of pressure release, has avoided appearing the dead condition of card, can also very big reduction hole sealing capsule's recovery time, like this, acts on two plunger top through the oil pressure, the inflation and the shrink of realization hole sealing capsule that can be convenient have shortened greatly and have suppressed and the pressure release time, have improved test efficiency. The method has the advantages of small investment, easy construction, simple operation steps, short test process time and safe and reliable operation process, can solve the problem that the traditional capsule is difficult to retract under the test working condition of more soft rock, can ensure that the measurement result of data is more accurate, and has better popularization value and practicability.
Claims (6)
1. A device for testing the height of two belts of a top plate comprises a first hole sealing capsule (12), a second hole sealing capsule (11) and a testing rod (7), and is characterized by further comprising a double-acting connecting mechanism (13), an oil pump (1), a pressure measuring instrument (2) and a water pump (3);
the first hole sealing capsule (12), the double-acting connecting mechanism (13) and the second hole sealing capsule (11) are coaxially arranged from top to bottom;
the first hole sealing capsule (12) comprises a first rigid water pipe (12.1) positioned in the center, a first capsule body (12.5), a first rigid guide sleeve (12.6), a second rigid guide sleeve (12.3) and a plurality of first connecting rings (12.2); the upper end of the first rigid water pipe (12.1) is closed, an external thread structure I (12.7) is arranged on the outer side of the lower end of the first rigid water pipe, a first annular through hole is formed in the center of the first capsule body (12.5), and the first annular through hole is sleeved on the outer side of the middle part of the first rigid water pipe (12.1); the first rigid guide sleeve (12.6) is fixedly sleeved outside the upper part of the first rigid water pipe (12.1), and the lower end of the first rigid guide sleeve is fixedly connected with the upper end of the first capsule body (12.5); the second rigid guide sleeve (12.3) is sleeved outside the lower part of the first rigid water pipe (12.1) in a sliding manner, and the upper end of the second rigid guide sleeve is fixedly connected with the lower end of the first capsule body (12.5); a plurality of first connecting rings (12.2) are uniformly and annularly and fixedly connected to the lower end surface of the second rigid guide sleeve (12.3);
the double-acting connecting mechanism (13) comprises a rigid shell (13.5), two plunger jacks (13.1), a rigid communicating pipe (13.3), a rigid oil pipe B (13.7) and two hollow sleeves (13.6); the rigid shell (13.5) is of a cylindrical structure, the inner side of the upper end and the inner side of the lower end of the rigid shell (13.5) are fixedly connected with an annular limiting plate A (13.10) and an annular limiting plate B (13.9) respectively, the upper end face of the annular limiting plate A (13.10) is annularly and uniformly and fixedly connected with a plurality of second connecting rings (13.15), the plurality of second connecting rings (13.15) and the plurality of first connecting rings (12.2) are arranged in a one-to-one corresponding mode, and the first connecting rings (12.2) and the second connecting rings (13.15) are connected through first springs (8); a plurality of third connecting rings (13.14) are fixedly connected to the lower end surface of the annular limiting plate B (13.9) in an annular direction uniformly; axial through holes are formed in the axle centers of the two plunger jacks (13.1), the axial through holes are arranged at the upper part and the lower part of the inner cavity of the rigid shell (13.5) in an up-down symmetrical mode, and the outer circular surfaces of the axial through holes are respectively in sliding sealing fit with the inner circular surfaces of the annular limiting plate A (13.10) and the annular limiting plate B (13.9); the outer sides of the ends, close to the two plunger jacks (13.1), of the two plunger jacks are fixedly connected with annular bosses A (13.11), and the outer circular surfaces of the two annular bosses A (13.11) are in sliding sealing fit with the inner side wall of the rigid shell (13.5); the outer diameter of the rigid communicating pipe (13.3) is the same as that of the first rigid water pipe (12.1), and the rigid communicating pipe is inserted into the axial through holes of the two plunger plungers (13.1) and is in sliding sealing fit with the axial through holes; the inner side of the upper end and the inner side of the lower end of the rigid communicating pipe (13.3) are respectively provided with a first internal thread structure (13.8) and a second internal thread structure (13.16), and the upper end of the rigid communicating pipe is fixedly sleeved on the inner side of the lower end of the first rigid water pipe (12.1) through the matching of the first internal thread structure (13.8) and the first external thread structure (12.7); an annular rodless cavity is enclosed among the rigid shell (13.5), the rigid communicating pipe (13.3) and the two annular bosses A (13.11); an upper annular rod cavity is formed by enclosing the upper part of the rigid shell (13.5), the plunger top head (13.1) at the upper side, the annular boss A (13.11) at the upper side and the annular limiting plate A (13.10), and an upper oil inlet and outlet pipeline (13.12) communicated with the upper annular rod cavity is fixedly connected to the upper part of the rigid shell (13.5); a lower annular rod cavity is formed by enclosing between a plunger top (13.1) at the lower part and the lower side of the rigid shell (13.5), an annular boss A (13.11) at the lower side and an annular limit plate B (13.9), and a lower oil inlet and outlet pipeline (13.13) communicated with the lower annular rod cavity is fixedly connected to the lower part of the rigid shell (13.5); the rigid oil pipe B (13.7) is coaxially arranged at the center of the rigid communicating pipe (13.3), the upper end of the rigid oil pipe B is bent and penetrates out of the middle part of the rigid communicating pipe (13.3) to enter the annular rodless cavity, and the rigid oil pipe B is fixedly connected with the rigid communicating pipe (13.3); the lower end of the rigid oil pipe B (13.7) is fixedly connected with the inner side wall at the lower end of the rigid communicating pipe (13.3) through a plurality of first connecting rods (13.2); the two hollow sleeves (13.6) are radially arranged in the annular rodless cavity, the inner ends of the two hollow sleeves are respectively and fixedly connected to the side walls of the two opposite sides of the middle part of the rigid communicating pipe (13.3), and the two hollow sleeves are communicated with the inner cavity of the rigid communicating pipe (13.3) through two radial holes A formed in the two opposite sides of the middle part of the rigid communicating pipe (13.3); the outer ends of the two hollow sleeves (13.6) are respectively fixedly inserted into two radial holes B on two opposite sides of the middle part of the rigid shell (13.5) and are in sealing fit with the radial holes B; the upper oil inlet and outlet pipeline (13.12) and the lower oil inlet and outlet pipeline (13.13) are respectively communicated with an oil tank arranged on the ground through a long oil pipe A;
the second hole sealing capsule (11) comprises a second rigid water pipe (11.1) positioned in the center, a rigid oil pipe A (11.2), a second capsule body (11.5), a third rigid guide sleeve (11.8), a fourth rigid guide sleeve (11.3) and a plurality of fourth connecting rings (11.6); the outer diameter of the second rigid water pipe (11.1) is the same as that of the first rigid water pipe (12.1), the lower end of the second rigid water pipe (11.1) is fixedly connected with a test rod joint (11.9), the outer side of the upper end of the second rigid water pipe is provided with a second external thread structure (11.4), and the second external thread structure (11.4) and a second internal thread structure (13.16) are inserted and connected to the outer side of the lower end of the rigid communicating pipe (13.3) in a threaded fit manner; the rigid oil pipe A (11.2) is coaxially arranged at the center of the second rigid water pipe (11.1), the upper end of the rigid oil pipe A is fixedly connected with the lower end of the rigid oil pipe B (13.7), the pipe wall of the upper end of the rigid oil pipe A is fixedly connected with the inner side wall of the upper end of the second rigid water pipe (11.1) through a plurality of radially distributed connecting rods A (11.7), and the lower end of the rigid oil pipe A is bent, penetrates out of the pipe wall of the lower end of the second rigid water pipe (11.1) and is fixedly connected with the second rigid water pipe (11.1); a second annular through hole is formed in the center of the second capsule body (11.5), and the second annular through hole is sleeved on the outer side of the middle part of the second rigid water pipe (11.1); the third rigid guide sleeve (11.8) is sleeved outside the upper part of the second rigid water pipe (11.1) in a sliding manner, and the lower end of the third rigid guide sleeve is fixedly connected with the upper end of the second capsule body (11.5); the fourth rigid guide sleeve (11.3) is fixedly sleeved outside the lower part of the second rigid water pipe (11.1), and the upper end of the fourth rigid guide sleeve is fixedly connected with the lower end of the second capsule body (11.5); a plurality of fourth connecting rings (11.6) are annularly and uniformly fixedly connected to the upper end face of the third rigid guide sleeve (11.8); the plurality of fourth connecting rings (11.6) and the plurality of third connecting rings (13.14) are arranged in a one-to-one correspondence manner, and the fourth connecting rings (11.6) and the third connecting rings (13.14) are connected through second springs (9);
an axial through hole (4) is formed in the axis of the test rod (7), the upper end of the axial through hole is fixedly inserted into a test rod joint (11.9), and the axial through hole is communicated with the inner cavity of the second rigid water pipe (11.1) through the test rod joint (11.9);
the oil pump (1) is communicated with the upper end of a rigid oil pipe A (11.2) in the second hole sealing capsule (11) through a long oil pipe B (5);
the water pump (3) is connected with the axial through hole (4) of the test rod (7) through a water injection pipe (6) with a pressure measuring instrument (2).
2. The device for testing the height of the two top plates is characterized in that a threaded cavity is formed in the testing rod joint (11.9), a threaded joint is formed on the outer side of the upper end of the testing rod (7), and the testing rod (7) is fixedly inserted into the threaded cavity of the testing rod joint (11.9) through threaded fit.
3. The device for testing the height of the two top plates according to claim 1 or 2, wherein the rigid communicating pipe (13.3) is fixedly connected with two short joints (13.4) at the outer sides of the two radial holes A, the two short joints (13.4) are both in a cylindrical structure, the inner cavity of the outer side of each short joint is provided with an internal thread structure D, and the inner cavity of the inner end of each short joint is communicated with the inner cavity of the rigid communicating pipe (13.3) through the radial holes A; external thread structures D are arranged at the inner ends of the two hollow sleeves (13.6), and the two short connectors (13.4) are inserted in a threaded matching mode through the external thread structures D and the internal thread structures D.
4. The test device for the height of two top plates according to claim 3, characterized in that the rigid shell (13.5) is provided with two containing grooves (13.17) which are concave towards the inside at the portions of the two radial holes B;
the outer ends of the two hollow sleeves (13.6) are correspondingly and fixedly connected with two annular bosses B (13.18) at the outer sides of the two accommodating grooves (13.17);
two waterproof sealing rings (10) are correspondingly arranged between the two annular bosses B (13.18) and the two accommodating grooves (13.17).
5. The device for testing the height of the two top plates is characterized in that the testing rod (7) is formed by sequentially connecting a plurality of single drill rods with the same size.
6. A method for testing the height of two top plates is characterized by comprising the following steps:
the method comprises the following steps: placing the oil pump (1), the pressure measuring instrument (2), the water pump (3) and the oil tank at corresponding positions on the ground, and connecting the oil outlet end of the long oil pipe B (5) with the upper end of the rigid oil pipe A (11.2) in the second hole sealing capsule (11) in a through manner;
step two: fixedly connecting a first hole sealing capsule (12) and a second hole sealing capsule (11) through a double-acting connecting mechanism (13), connecting a third connecting ring (13.14) and a fourth connecting ring (11.6) through a second spring (9), and connecting a first connecting ring (12.2) and a second connecting ring (13.15) through a first spring (8), so as to assemble a hole sealing assembly; fixedly connecting a test rod connector (11.9) at the lower end of the assembled hole sealing assembly to the upper end of a test rod (7) so as to form a test assembly, and starting to push the test assembly into a drill hole dug on the top plate;
step three: recording the pushing depth in real time, and ensuring that the hole sealing assembly is accurately pushed to the position of the test section;
step four: after pushing, connecting the oil inlet end of the long oil pipe B (5) with the oil outlet of the oil pump (1), and connecting the water pump (3) with the axial through hole (4) at the upper end of the test rod (7) through the water injection pipe (6);
step five: starting an oil pump (1) to inject oil into an annular rodless cavity in a double-acting connecting mechanism (13), enabling two plunger jacks (13.1) to completely extend out to the upper side and the lower side, further compressing a first capsule body (12.5) and a second capsule body (11.5), enabling the first capsule body (12.5) and the second capsule body (11.5) to expand and cling to surrounding rocks, then starting a water pump (3) to inject water in a water storage tank into an axial through hole (4) in a test rod (7), further injecting the water into a plugging hole section, and in the process, injecting water at constant pressure through a pressure regulating valve arranged on a water injection pipe (6) and a pressure measuring instrument (2);
step six: recording the amount of water injected from the start to the end and the time used for the process by observing the pressure gauge (2) and the stopwatch;
step seven: after each section of experiment is finished, the double-acting connecting mechanism (13) is decompressed, then the recovery testing rod (7) repeats the fifth step and the sixth step for the next section of water pressing test section, after all the test sections are tested, the water injection pipe (6) and the long oil pipe (5) are dismounted, and the hole sealing assembly is completely pulled out of the drill hole;
step eight: and calculating the water amount injected into the hole section in unit time and leaked through the hole wall cracks according to the total injected water amount and the total used time, and determining the heights of the two zones of the top plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675855.4A CN113514383B (en) | 2021-06-18 | 2021-06-18 | Device and method for testing heights of two belts of top plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675855.4A CN113514383B (en) | 2021-06-18 | 2021-06-18 | Device and method for testing heights of two belts of top plate |
Publications (2)
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